aptitude - held broken packages

[marc <gmane@auxbuss.com>]

Hi,

After an aptitude upgrade last week on an etch machine, which pulled in 
all the KDE 3.4 packages, I am having problems installing a few 
packages.

For example
# aptitude install kate-plugins
returns
E: Unable to correct problems, you have held broken packages.
E: Unable to correct dependencies, some packages cannot be installed
E: Unable to resolve some dependencies!
Some packages had unmet dependencies.  This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.

The following packages have unmet dependencies:
  kate-plugins: Depends: kdelibs4 (>= 4:3.3.2-4.0.2) but it is not 
installable
                Depends: libqt3c102-mt (>= 3:3.3.4) but it is not 
installable


However, if I try to install libqt3c102-mt, then aptitude wants to 
remove hundreds of packages - basically, all the KDE packages.

Can anyone suggest a way to proceed,please. Thanks.

-- 
Best,
Marc